Pulp-screen.



No. 759,710. PATENTBD MAY 10, 1904.

.N. B. HAYES.

PULP SCREEN.

APPLICATION FILED RAB. 1. 190-1. 7 H0 MODEL. 3 SHEETS-SHEET 1.

WJTN [NI/ENTOR K: w 0 firmmflflaqaa Aim/way No. 759,7l0. PATENTED MAY 10, 1904. N. B. HAYES.

PULP SCREEN.

APPLIUATION FILED MAR. 1- 1904.

N0 MODEL. 3 SHBETSBHEBT 2.

PATENTED MAY 10, 1904. N. B. HAYES. PULP SCREEN.

APPLICATION Hum 11.3.1. 1904.

3 SHEETS-SHEET 8.

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W1 T/VES NITED STATES Patented May 10, 1904.

NORMAN B. HAYES, OF VVA'JTERIOVVN, NEW YORK, ASSIG-NOR OF ONE- HALF TO CHARLES S. KELLOGG, OF WVATERTOW N, NEW YORK.

PULP-SCREEN.

SPECIFICATION forming part of Letters Patent No.759,710, dated May 10, 1904.

To (tZZ whom. it may concern:

Be it known that I, NORMAN B. HAYEs, a citizen of the United States, residing at Watertown, in the county of Jefferson and State of New York, have invented certain new and useful Improvements in Pulp-Screens; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to makeand use the same, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in pulp-screens; and the'object of the invention is to provide an apparatus in which hydraulic mechanism is employed for forcing the stock through the screen and in which air under pressure is forced out through the perforations of thescreen for the purpose of cleaning the screen-plates.

My invention consists, further, in various details of construction and in combinations and arrangements of parts, as will be hereinafter fully described, and then specifically defined in the appended claims.

I illustrate my invention in the accompanying drawings, which, with the letters of reference marked thereon, form a part of this application, and in which similar letters of reference indicate like parts in the several views, in which- Figure 1 is a top plan view of my apparatus. Fig. 2 is a central longitudinal sectional view, and Fig. 3 is a cross-sectional view on line 3 3 of Fig. 1. Fig. 4 is a central vertical section of a portion of the cylinder.

Reference now being had to the details of the drawings by letter, A designates a vat, which may be of any size and constructed of any desired material, supported on legs B, and O O designate two sections of a hollow cylindrical shaft, the adjacent ends of which are flanged and fastened together by bolts O, a partition D intervening between said flanged ends, as shown in Fig. 2. Said shaftsections are journaled in suitable bearings in the ends Application filed March 1, 1904. Serial No. 196,044. (No model.)

of the vat and are provided with glands (Z. A rotary movement is imparted to the shaft by means of a sprocket-wheel E, which is fixed to one end of the shaft, which projects through the end of the vat, and power may be communicated to said sprocket-wheel in any suitable manner. (Not shown.) One end of the hollow shaft, made up of the two sections, as described and designated by letter (i, is an air-chamber into which air is drawn through the valve-regulated aperture H at one end of the shaft on the outward throw of the piston-stem I A screen-cylinder K is fastened at its ends to the flanges O upon said sections of the hollow shaft, and screen-plates K form an inclosure to said screen-cylinder. These screenplates may be of any size or shape and in the present instance are illustrated as being held end toend and having parallel rows of slits. Secured to the ends of the screen-cylinder are the partitions L, (shown clearly in Fig. 3,) which are secured to the radial arms L, that are fastened at their outer ends to the ends of the screen-plates. Communicating between the air-chamber G and the space intermediate the partitions L and the screen-plates is a series of open-ended pipes M, each of which is provided with a check-valve M, allowing air to pass only in one direction and that from the compartment G into the space referred to and designated by letter N.

Oomm unicating between the hydraulic con1- partment of the hollow shaft, which compartment is designated in the drawings by letter Gr, and. said space N is a series of open-ended tubes O, through which the stock is drawn into said hydraulic compartment, as desig nated by arrows. The piston-stem I has a play through a suitably-packed aperture in the partition 1) and has secured thereto two pistons Q and Q, the former of which works in the air chamber or compartment (fr, while the latter is provided with valve-regulated apertures and is adapted to work in the hydraulic compartment G. The valve (7, which regulates the apertures in the piston Q, is

spring-actuated, being normally held in a closed relation by means of the spring g,

which spring bears against a collar g fixed to the piston-stem. A suitable vent-aperture J is provided in the air-compartment, whereby air will not be trapped behind the piston Q, on its inward throw beyond the pipes M.

P designates a boxing fastened to the end of the vat and over the outer end of the hydraulic compartment of the hollow shaft and into which the stock from the latter is discharged. The piston-stem passes through a suitably-packed aperture, in the wall of said box and is connected to a pitman R, which in turn is ,pivotally connected to a pin on the disk R. rotating with the shaft R which latter is drivenby gear connections with a shaft 0 In the bottom of the-vat is a series of exitapertures T, and a slide-valve T is provided to allow said apertures to be open, or partially so, or closed, as may be; desired. Positioned underneath the vat is an auxiliary vat or tank V8 into which any coarse material from the stock may be drawn. A suitable exit valveregulated pipe W leads away from said tank W. A rod T is fastened to said slide and extends through a gland in the end of the vat and towhich a handle may be attached, whereby the slide may be moved longitudinally.

In operation the stock is fed into the vat and the screen-cylinder made to revolve simultaneously with the reciprocating of the piston-stem, which will cause on its outer throw the stock to be drawn by the piston Q into. the hydraulic compartment of the sec tional shaft. The same movement of the pis ton-stem will cause the piston Q to move toward the partition D and draw in air into the compartment G, and of the inner throw of the piston the stock will pass through the piston Q into.the hydraulic compartment G, and the air in the compartment G will be compressed and a portion thereof caused to be forced out of the tubes M and against the innersurfaces of the screen-plates, whereby the latter may be cleansed of any stock clinging thereto. The stock Whichis drawn off through thehollow shaft enters the boxing and makes exit through the discharge-opening therein,

Any coarse material of the stock which is not drawn through the screen-plates may be drawn off through the valve-regulated apertures in the bottom of the vat, as will be readily understood.

While I have shown a particular. constructionof pulp-screen embodyingthe featuresof my apparatus, it will beunderstood that 1 do not confine my invention to the exact construction shown, but. may vary the same, if found desirable, without in any way departing from the spirit of the invention.

Having thus described my invention, what I claim to be new, and desire to secure by Letters Patent, is

1. A pulp-screening apparatus, comprising a vat, a hollow shaft rotatably mounted in said vat, a screen-cylinder fixed to and rotating with said shaft, means for drawing stock through the screen-plates of the cylinder into said shaft as the latter is rotated, and means for forcing air from the shaft into the interior of the screen-cylinder, asset forth.

2. A pulp-screening apparatus, comprising a vat, a hollow shaft rotatably mounted within said vat, a screen-cylinder fixed to said shaft, a partition intermediate the screen-plates of said cylinder and said shaft, open-ended pipes communicating between said shaft and the space outside said partition within the cylinder, and a piston working in said shaft as the latter is rotated, as set forth.

3. A pulp-screening apparatus, comprising a vat, a hollow compartment-shaft rotatably mounted within the vat, a pulp-screen fixed to said shaft, a partition intermediate the screenpla-tes of the pulp-cylinder and said shaft, openended pipes communicating between said shaft and the space outside said partition and within the cylinder. a piston-stem havingaplay within the compartments of the shaft, pistons scoured to said stem, and one mounted in each compartment, and so arranged that stock may be drawn from the cylinder into the shaft by one piston, and air forced from the other compartment into said space and against the screen-plates, as set forth.

4. A pulp-screening apparatus, comprising a vat, a hollow sectional cylinder rotatably mounted therein, and having a hydraulic and a compressed-air compartment, a springpressed valve at one end of said compressedair compartment, a piston stem working through a partition dividing the compressedair compartment from the hydraulic compartment, pistons fixed to said stem, one being mounted in each compartment, a screen-cylinder fixed to and rotating with said shaft, a partition intermediate said shaft and the screen-plates of the cylinder, open-ended pipes leading from the compartments of the shaft and communicating with the space between said partition and the screen-plates of the cylinder,and means for reciprocating said pistonstem, simultaneously with the rotary movement of the cylinder, as set forth.

5. A pulp-screening apparatus comprising a, vat, with a series of apertures in the bottom thereof, a slide-valve over said apertures, an auxiliary vat underneath said sl1de-valve, a rotatable hollow compartment-shaft mounted within the vat proper, a pulp-screen fixed to and rotating with said shaft, a partition intermediate the shaft and the screen-plates of the cylinder, open-ended valveregulated pipes communicating between the compressed-air simultaneously with the reciprocationof the compartment of the shaft and said space, and shaft, as set forth.

open-ended pipes communicating between said In testimony whereof I hereunto aflix my space and the interior of the other compartsignature in presence of two Witnesses.

ment of the shaft, a piston-stem Working in NORMAN B. HAYES. said shaft, pistons secured thereto, a boxing Vitnesses:

at one end of the shaft into Which the stock is A. J. DEWEY,

discharged, and means for rotating the shaft VIRGIL K. KnLLoee. 

